<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表单项标签演示</title>
</head>
<body>
    <form action="#" method="get" autocomplete="on">
        <label for="username">用户名</label>
        <input type="text" id="username" name="username" value="" placeholder="请在此处输入信息" required/>
        <button type="submit">提交</button>
        <button type="reset">重置</button>
        <button type="button">按钮</button>
    </form>
</body>
</html>